PT4770 Graphite Filled High Temperature Casting System


PT4770 is a graphite filled high temperature casting resin designed for use in fabricating tooling and components that require good heat resistance in service. PT4770 is capable of operating at temperatures in excess of 400°F with good performance. PT4770 has very good handling characteristics, with a mixed viscosity that allows easy pouring and good reproduction of surface details. The specially selected graphite fillers provide easy machining, good compressive strength, and, most importantly, aid in matching the coefficient of expansion of other composite components. PT4770 is
an excellent choice for high temperature applications where toughness, good wear characteristics and dimensional stability are required.
The two high temperature hardeners listed herein for use with PT4770 resin provide a choice of gel times to allow the making of small or large items with minimum shrinkage and stress build-up in the finished casting.PT4770 Part B provides a working time of one hour, which is sufficient for the casting of small to medium shapes, and PT4770 Part B1 has a working time of almost three hours, which is useful for larger castings. There are no restricted or regulated raw materials used in these high temperature products. PT4770 resin does not contain vinylcyclohexane diepoxide (VCHD), or other hazardous or potentially restricted diluents. The Parts B of this system do not contain methylene dianiline (MDA) or other potentially harmful aniline derivatives. They are non-staining and will not crystallize in normal shipping and storage conditions.

 PT4770 A
PT4770 B
PT4770 B1
ASTM Method 
120,000 cps
1650 cps
70 cps
Specific Gravity, gms./cc
Mix Ratio, by Weight

100 : 12
100 : 15
Pot Life, 4 fl oz Mass @ 77°F
1 hour
2.5 – 3 hours


When using PT4770 Part B, the casting will gel hard in 18 to 24 hours at 77 O F. In lower temperature service, non-critical applications, the system can usually achieve its full cure in service. However, for maximum stability, an oven post cure is recommended, and is mandatory in applications where continuous service is over 250 O F. When using PT4770 Part B1, under normal conditions the system will gel to a hard demoldable state in 24 to 36 hours. In colder shop environments, or unusual conditions, the user should check closely to insure that the resin has fully gelled before the casting is post cured.


Gallon Kit
Pail Kit
Drum Kit
PT4770 Part A
11 lb.
55 lb.
550 lb.
PT4770 Part B
1.34 lb.
6.6 lb.
66 lb.
PT4770 Part B1
1.66 lb.
8.25 lb.
84 lb.

Inasmuch as PTM&W Industries, Inc. has no control over the use to which others may put material, it does not guarantee that the same results as those described herein will be obtained. The above data was obtained under laboratory conditions, and to the best of our knowledge is accurate. This information is presented in good faith to assist the user in determining whether our products are suitable for his application. No warranty or representation, however is intended or made, nor is protection from any law or patent to be inferred, and all patent rights are reserved. Before using, user shall determine the suitability of the product for his intended use, and user assumes all risk and liability whatsoever in connection therewith. In no event with PTM&W Industries, Inc. be liable for incidental or consequential damages. Buyer’s sole and exclusive remedy in such instances shall be limited to replacement of the purchase price.

 PT4770 A/B
PT4770 A/B1ASTM Method
Mix Ratio, by Weight
100 : 12
100 : 15
Mixed Viscosity, @77°F, centipoise
28000 cps
13400 cps
Working Time, 4 fl. oz. Mass @ 77°F
1 hour
2.5 – 3 hrs
Cured Hardness, Shore D
89 Shore D
89 Shore D
Shrinkage, in/in, Mold #1, Vol: .053 Gal.0033.0039D2566
Specific Gravity, grams, cc
Density, lb./cu. in.
Specific Volume,  cu. in./lb.
Tensile Strength, psi 
7690 psi
7180 psi
Elongation at Break, %
1.54 %
1.53 %
Compressive Strength, psi
20870 psi
20490 psi
Glass Transistion Temperature, DMA:


PTM&W epoxy products are made from raw materials carefully chosen to minimize or even eliminate toxic chemicals, and therefore offer the user high performance products with minimum hazard potential when properly used.  Generally, the PTM&W epoxy resins and hardeners will present no handling problems if users exercise care to protect the skin and eyes, and if good ventilation is provided in the work areas.  However, all epoxy resins and hardeners can be irritating to the skin, and prolonged contact may result in sensitization; and breathing of mist or vapors may cause allergenic respiratory reactions, especially in highly sensitive individuals.  As such, avoid contact with eyes and skin, and avoid breathing vapors.  Wear protective rubber apron, clothing, gloves, face shield or other items are required to prevent contact with the skin.  In case of skin contact, immediately wash with soap and water, followed by a rinse of the area with vinegar, and then a further wash with soap and water.  The vinegar will neutralize the hardener and lessen the chances of long term effects.  Use goggles, a face shield, safety glasses or other items as required to prevent contact with the eyes.  If material gets into the eyes, immediately flush with water for at least 15 minutes and call a physician.  Generally, keep the work area as uncluttered and clean as possible, and clean up any minor spills immediately to prevent accidental skin contact at a later time.  Keep tools clean and properly stored.  Dispose of trash and empty containers properly.  Do not use any of these types of products until Material Safety Data Sheets have been read and understood.